Rotary gravel-screen.



H. MIDDAUGH.

' ROTARY GRAVEL scmzeu.

- APPLICATION FIL'ED SEPT. 20, 1915- I 7 1,169,986, 1 Patented Feb. 1, 1916.

2 SHEETS-SHEET 1- THE COLUMBIA PLANDGRAPII co., WASHINGTON, u c

' H. MIDDAUGH.

ROTARY GRAVEL SCREEN.

APPLICATION FILED SEPT. 20, m5.

Patented Feb. 1, 1916.

2 SHEETS-SHEET 2 8% G0 00C) ()9 QC) THE COLUMBIA PLANOORAPH co., WASHINGTON, D C.

Homer. M DDAUGH; or SEATTFE}WASHINGT6NS noTARYeRAvn'nscREENJ Specification of Lettersratent.

Patented Feb. 1, 191

Application filed September 20, I915. serial in. 51 ,536. 4

.To all whom it may concern Cir . Be it known that I,- HOR'ACE 'MIDDAUG'H, citizen of the United States of America, and resident of the city of Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements .in Rotary .sGravel- Screens, of which the following is a specification.

My invention consists of a rotary gravel screen having certain features of novelty which will be hereinafter particularly defined in the claims.

The object of my invention is to produce a screen of large capacity which shall be efficient and reliable in its working, and which shall be durable and easy of repair.

In the accompanying drawings I have shown my invention in the form of construction which is now preferred by me.

Figure 1 is a side view in perspective of my screen. Fig. 2 is an end view in perspective of the screen. Fig. 3 is a radial section through one side of the barrel, showing the manner of fastening the screening bars. Fig. 4 is a like view showing the permanent frame member which connects the end rings. Fig. 5 is a view looking outwardly from the center of the barrel showing one permanent frame member and a few screen bars. Figs. 6 and 7 are sections on lines 66 and 77 of Fig. l looking toward respectively opposite ends, showing the manner of securing the screen bars to the end rings of the frame. Fig. 8 is a sectional detail showing the manner of securing the feed vanes.

This screen is of the barrel type which is turned about its axis, the gravel being moved lengthwise thereof and the large gravel being discharged at one end. The barrel is preferably made as frustum of a cone.

The permanent frame of this barrel, as herein shown, consists of the end rings 1, 2, and connecting bars or beams 3. I have only shown two such bars 3, these being channel bars with their flanges positioned radially of the barrel. The ring 2 has special recesses for the reception of its ends of bars 3, while ring 1 simply omits certain of the flanges 12 for the same purpose. The webs of these channels are preferably perforated, as at 30.

The rings 1 and 2 have trackways, 11 and 21 respectively, by which it rests upon wheels 4, so that the barrel may be turned.

One of the rings, as'2, has a gear. 24, secured to or made integral therewith, by which powerfmay' be applied-to'turn it; To securely retain it in positioinfianges 10 and 20 are used. "The spaces between the channel bars 3 are filled by bars 5. These are flat bars and'have a series of lateral proections, 51, spaced to divide the space be tween adjacent bars into small spaces, thereby preventing passage of fiat slabs. One of the bars 50, at one side of each channel 3, has projections on both sides, but all the others on one side only. Ring 2 has sockets 22 for the reception of the ends of bars 5. Ring 1 has lugs 12 to which the ends of the bars are bolted. Should one side of the bars and projections become worn, the bars may be turned over.

IVithin the barrel are feeding vanes 6. These have webs extending inwardly from the bars and helically, whereby the material fed in at one end is caused to travel toward the other end by the rotation of the barrel. These feeding vanes are preferably made of angle iron with one web contacting with the inner surface of bars 5. These may be conveniently secured by bolts 7 which pass through one flange of the angle iron and have their head end in the form of a hook 70, which hooks over the outer edge of a grate bar 5.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of theUnited States of America, 1s: 1

1. A rotative gravel screen comprising a frame consisting of a ring at each end and beams fixedly connecting said rings, and screen bars of flat section having their width placed radially and their ends secured to the end rings, and pins projecting laterally from one side of each screen bar.

2. A rotative gravel screen comprising a frame consisting of end rings and longitudinal beams having their ends fixedly secured to the rings, screen bars extending between said rings and having pins projecting at one side toward the adjacent bar, one ring having sockets for the endwise insertion of the bars and the other having corresponding lugs, alongside of which the ends of the screen bars may be placed, and bolts securing the end of each screen bar to its lug.

3. A rotative gravel screen comprising end rings and longitudinal bars of flat cross section connecting said rings and placed With their Width radially of the screen, pins projecting laterally from one side of said bars along their central axes. and means for securing said bars to permit their being. turned to reverse thelr edges.

4:. A rotative gravel screen comprisin end rings having exterior trackway surfaces,

longitudinal beams fixedly connecting said ing inwardly projecting lugs, and bolts securin the bars to said lugs.

5. rotative gravel screen comprising a frame consisting of a ring at each end and beams fixedly connecting said rings, and screen bars of flat section having their Width placed radially and their ends secured to the end rings, pins projecting laterally from one side of each screen bar, and helically placed feed vanes secured Within the screen bars. s

'Signed at Seattle, Washington, this 13 day of September, 1915.

HORACE MIDDAUGH.

Copies of this Patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

